Datasheet

805
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
35.7.5 Register Write Protection
To prevent any single software error from corrupting SPI behavior, certain registers in the address space can be
write-protected by setting the WPEN bit in the SPI Write Protection Mode Register (SPI_WPMR).
If a write access to a write-protected register is detected, the WPVS flag in the SPI Write Protection Status
Register (SPI_WPSR) is set and the WPVSRC field indicates the register in which the write access has been
attempted.
The WPVS bit is automatically cleared after reading SPI_WPSR.
The following registers can be write-protected:
 SPI Mode Register
 SPI Chip Select Register